Key assembly and keyboard

Abstract

The utility model discloses a kind of key assembly and keyboard, it is related to keyboard technical field, wherein, key assembly includes key core assembly and first PCB board, the key core assembly includes the pressing piece and magnetic piece that can be moved synchronously;First magnetic sensor and second magnetic sensor are provided on the first PCB board, and first magnetic sensor and second magnetic sensor are arranged upside down.The technical scheme provided by the utility model is to improve the detection stroke of key.

Description

Technical Field

[0001] This utility model relates to the field of keyboard technology, and in particular to a key assembly and a keyboard. Background Technology

[0002] In today's information age, keyboards, as the core input device for human-computer interaction, are widely used in many fields such as computers, laptops, smart terminals, and industrial control equipment. Their performance directly affects the user's input efficiency, operating experience, and even the comfort of long-term use. Therefore, optimizing the structure and improving the performance of keyboard key components has always been one of the key research and development directions in the industry. In the design of keyboard key components, key actuation and travel detection are key aspects of achieving accurate input. As users' demands for input experience continue to increase, not only are sensitive trigger responses required, but higher standards are also being set for key travel length, stability, and consistency. A longer and linear key travel can simulate the tactile feel of a traditional mechanical keyboard, effectively reducing the probability of accidental keystrokes, while providing users with clear tactile feedback. Especially in scenarios such as long-term text input and gaming, it can significantly reduce finger fatigue and improve operational comfort and accuracy. Currently, most mainstream keyboard key components on the market use Hall effect sensors as the core detection element for key travel. Hall effect sensors achieve non-contact position detection based on the Hall effect, offering advantages such as fast response speed, long lifespan, and strong anti-interference capabilities. They effectively meet the high-frequency pressing requirements of keyboard keys and are therefore widely integrated into various mechanical keyboards, membrane keyboards, and other products. However, in existing technologies, keyboard key assemblies typically only have a single Hall sensor along the key's movement path. This design has significant performance limitations in practical applications: due to the limited effective detection range of a single Hall sensor, to ensure the sensor can accurately capture the key's trigger signal (i.e., detect the displacement of the key from its initial position to the trigger position), its installation position must strictly correspond to the key's trigger travel range. This limits the overall measurable travel of the key to the detection range of a single sensor. Generally, key assemblies using a single Hall sensor typically have an effective travel of only 2.0-3.0mm, which is insufficient to meet users' needs for longer travel (e.g., 3.5-4.4mm) in terms of tactile feedback. Further analysis reveals that the detection principle of a single Hall effect sensor dictates that it can only achieve accurate displacement detection within a specific range of magnetic field changes. When the key travel exceeds this range, the linearity of the sensor's output signal decreases significantly, and it may even fail to accurately reflect the actual position of the key, leading to issues such as trigger delay, incomplete rebound, or inconsistent travel feedback. Furthermore, to accommodate the detection range of a single sensor, the mechanical structure of the key (such as spring height and keycap travel limits) must be adjusted accordingly, further limiting the flexibility of travel design and making it difficult to meet the diverse tactile needs of different user groups. In the context of increasingly fierce competition in the consumer electronics market, users' demands for keyboard experience are constantly upgrading, and longer key travel has become one of the important indicators distinguishing mid-to-high-end keyboard products. Existing key components based on a single Hall sensor are gradually failing to meet the market's demand for high-performance keyboards due to limited travel. There is an urgent need for a technical solution that can effectively increase key travel while ensuring detection accuracy and operational stability, in order to break through the current technical bottleneck and enhance the competitiveness of keyboard products. Utility Model Content

[0003] The main objective of this invention is to provide a key assembly and keyboard that increases the key travel distance.

[0004] To achieve the above objectives, the button assembly proposed in this utility model includes: The key core assembly includes a synchronously movable pressing element and a magnetic element; A first PCB board is provided with a first magnetic sensor and a second magnetic sensor, which are arranged one above the other.

[0005] In one embodiment, both the first magnetic sensor and the second magnetic sensor are Hall sensors; the magnetic poles of the magnetic element are distributed radially along the magnetic element.

[0006] In one embodiment, the first magnetic sensor and the second magnetic sensor are located on the same side of the magnetic element.

[0007] In one embodiment, a first through hole is provided on the first PCB board, which is used for the magnetic component to pass through.

[0008] In one embodiment, the first magnetic sensor and the second magnetic sensor are located around the first through hole.

[0009] In one embodiment, the first magnetic sensor and the second magnetic sensor are respectively mounted on the upper and lower surfaces of the first PCB board.

[0010] In one embodiment, the first magnetic sensor and the second magnetic sensor are arranged vertically and vertically in a direction perpendicular to the first PCB board.

[0011] In one embodiment, the button assembly further includes a second PCB board disposed below the first PCB board and a third magnetic sensor mounted on the second PCB board, the third magnetic sensor being located below the second magnetic sensor; and the first PCB board and the second PCB board are arranged parallel to each other.

[0012] In one embodiment, the button assembly further includes a fourth magnetic sensor mounted on the second PCB board, wherein the third magnetic sensor and the fourth magnetic sensor are respectively mounted on the upper and lower surfaces of the second PCB board.

[0013] In one embodiment, both the first magnetic sensor and the second magnetic sensor are TMR sensors; the magnetic poles of the magnetic element are distributed along the axial direction of the magnetic element.

[0014] This utility model also proposes a keyboard, including the aforementioned key components.

[0015] The technical solution of this utility model increases the travel of the button by using two magnetic sensors arranged vertically. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the button assembly provided by this utility model; Figure 2 A cross-sectional structural diagram of an embodiment of the button assembly provided by this utility model; Figure 3 A cross-sectional structural schematic diagram of another embodiment of the button assembly provided by this utility model.

[0018] Explanation of icon numbers: 10. Key core assembly; 11. Pressing component; 111. Pressing part; 112. Connecting rod part; 12. Magnetic component; 13. Fixing component; 131. Sliding groove; 132. Hollow shaft; 14. Elastic component; 20. First PCB board; 21. First magnetic sensor; 22. Second magnetic sensor; 23. First through hole; 30. Housing; 31. Second through hole; 40. Second PCB board; 41. Third magnetic sensor; 42. Fourth magnetic sensor.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] This utility model proposes a button assembly.

[0024] Please see Figure 1 and Figure 2In one embodiment of this utility model, the button assembly includes a key core assembly 10 and a first PCB board 20. The key core assembly 10 includes a pressing member 11 and a magnetic member 12, which can move synchronously. A first magnetic sensor 21 and a second magnetic sensor 22 are disposed on the first PCB board 20, and the first magnetic sensor 21 and the second magnetic sensor 22 are arranged vertically.

[0025] Specifically, in this embodiment, the pressing element 11 and the magnetic element 12 are synchronously connected. They are rigidly connected through a fixing structure such as snap-fit, adhesive, or interlocking, ensuring that when the user presses the pressing element 11, the magnetic element 12 moves synchronously with the pressing element 11 in the vertical direction without relative displacement deviation. This synchronous relationship is the basis for ensuring the accuracy of subsequent stroke detection—the displacement of the magnetic element 12 is completely consistent with the actual stroke of the pressing element 11, avoiding detection errors caused by relative movement between the two.

[0026] The magnetic component 12 is a shaft-shaped structure. When the pressing component 11 is in the initial unpressed state, the magnetic component 12 is located at the initial detection position close to the first magnetic sensor 21 (the upper sensor). As the user presses, the magnetic component 12 moves downward with the pressing component 11, first passing through the effective detection range of the first magnetic sensor 21, and then entering the effective detection range of the second magnetic sensor 22 (the lower sensor), forming a path coverage of relay detection by the upper and lower sensors.

[0027] The first magnetic sensor 21 and the second magnetic sensor 22 are complementary in function, performing continuous detection. Their effective detection ranges partially overlap or seamlessly connect in the vertical direction, avoiding detection blind spots. Simultaneously, both sensors are electrically connected to the signal processing circuit on the first PCB board 20. The detected magnetic field change signal (corresponding to the displacement of the magnetic component 12) is transmitted to the circuit in real time. A data fusion algorithm integrates the detection data from the two sensors to form a complete key travel displacement curve.

[0028] In this embodiment, by arranging the first magnetic sensor 21 and the second magnetic sensor 22 at vertical intervals, the effective detection ranges of the two sensors overlap and cover each other, breaking the limitation of a single sensor on the travel distance. Combined with the synchronously moving magnetic component 12, the effective travel distance of the button can be increased from 2.0-3.0mm in the traditional single-sensor solution to 3.5-4.4mm (or further extended according to the sensor spacing), fully meeting the user's needs for a long-travel pressing feel. It is especially suitable for scenarios such as long-term text input and game operation, which can significantly reduce finger fatigue and improve operating comfort.

[0029] Since the two sensors form a continuous detection range, the magnetic component 12 is always within the effective detection range of at least one sensor throughout the entire stroke, avoiding the problem of signal linearity degradation after exceeding the stroke in traditional single-sensor solutions.

[0030] Furthermore, both the first magnetic sensor 21 and the second magnetic sensor 22 are Hall sensors; the magnetic poles of the magnetic element 12 are distributed radially along the magnetic element 12.

[0031] Specifically, in this embodiment, the first magnetic sensor 21 and the second magnetic sensor 22 are Hall sensors. These sensors operate based on the Hall effect, enabling non-contact detection of changes in the magnetic field. They feature fast response speed (typically microseconds), high detection accuracy (capable of identifying minute changes in magnetic field strength), and strong resistance to electromagnetic interference. Furthermore, their compact size allows them to fit within the limited installation space of the first PCB board 20. The magnetic pole arrangement of the magnetic component 12 is explicitly defined as radial. That is, the N and S poles of the magnetic component 12 are not arranged along its axial direction (vertical, consistent with the direction of movement of the pressing component 11), but rather radially (horizontal, perpendicular to the direction of movement of the pressing component 11), forming a radial magnetic pole structure. For example, if the magnetic component 12 is a cylindrical permanent magnet, half of its cylindrical side surface is the N pole, and the other half is the S pole, with the boundary line between the N and S poles extending axially to ensure that the radial magnetic pole distribution remains stable during vertical movement of the magnetic component 12.

[0032] The combination of the radially distributed magnetic element 12 and the Hall sensor reduces the impact of external interference on detection. The magnetic field generated by the radial magnetic poles is concentrated in the horizontal direction, reducing magnetic field radiation interference to other electronic components (such as capacitors and resistors) on the first PCB board 20. At the same time, the Hall sensor itself has anti-electromagnetic interference capability. With the combination of the two, even in complex circuit environments (such as multiple key components inside a keyboard working simultaneously), the detection signals output by the two Hall sensors can remain stable.

[0033] Furthermore, the first magnetic sensor 21 and the second magnetic sensor 22 are located on the same side of the magnetic component 12. The first magnetic sensor 21 and the second magnetic sensor 22 are vertically aligned in a direction perpendicular to the first PCB board 20.

[0034] In this embodiment, the first magnetic sensor 21 and the second magnetic sensor 22 are arranged vertically opposite each other, located on the same side of the magnetic component 12, and facing the same magnetic pole of the magnetic component 12. That is, the magnetic field detection surfaces (sensing ends) of the two sensors do not face the N pole and S pole of the magnetic component 12 respectively, but are aligned together with a single radially distributed magnetic pole of the magnetic component 12 (for example, both facing the radial N pole of the magnetic component 12, or both facing the radial S pole). Combined with the structure of the radial magnetic pole distribution of the magnetic component 12 (such as half of the side of the axial magnetic component 12 being the N pole and half being the S pole), the center line connecting the sensing ends of the two vertically facing sensors is aligned with the center of the target magnetic pole region of the magnetic component 12, ensuring that both can synchronously capture the magnetic field signal generated by the same magnetic pole without deviation in the detection direction.

[0035] The signals output by the two sensors have the same direction and trend, eliminating the need for direction detection or signal inversion modules in the signal processing circuit. Signal fusion can be achieved simply through relay-style data splicing or averaging. For example, when the magnetic component 12 is within the detection range of the first sensor, the signal from the first sensor dominates; when it enters the detection range of the second sensor, it smoothly switches to the signal from the second sensor. This simplifies the signal processing logic, reduces the design complexity and production cost of the PCB board, and shortens the signal processing time.

[0036] Furthermore, a first through hole 23 is provided on the first PCB board 20, which is used for the magnetic component 12 to pass through.

[0037] Specifically, in this embodiment, the first through hole 23 and the magnetic component 12 form a vertically moving guiding and accommodating relationship. When the magnetic component 12 moves synchronously with the pressing component 11, its lower region can pass through the first through hole 23, breaking the spatial limitation of the first PCB board 20 on the movement path of the magnetic component 12—if the through hole is not provided, the downward movement of the magnetic component 12 will be blocked by the first PCB board 20, making it impossible to move a longer distance; while the existence of the first through hole 23 provides a passage for the magnetic component 12, so that the movement range of the magnetic component 12 is no longer limited to the upper surface of the first PCB board 20, and can extend to the lower surface of the first PCB board 20, providing a spatial basis for cooperating with the first magnetic sensor 21 and the second magnetic sensor 22 to achieve longer stroke detection. At the same time, the aperture limitation of the first through hole 23 ensures that the magnetic component 12 always moves in the vertical direction during the passage, avoiding changes in the relative position with the sensor due to horizontal offset, and ensuring the stability of magnetic field detection.

[0038] The first through hole 23 provides a passage for the magnetic component 12, so that the downward travel of the magnetic component 12 is no longer blocked by the first PCB board 20. It can extend from moving only outside the PCB board to moving through the upper and lower surfaces of the PCB board. Combined with the relay detection of the upper and lower sensors, the effective travel of the key can be increased by 0.5-1.0mm, and finally achieve a long travel of 4.0-4.5mm, which fully meets the needs of high-end mechanical keyboards for ultra-long travel pressing feel.

[0039] Furthermore, the first magnetic sensor 21 and the second magnetic sensor 22 are located around the first through hole 23. The first magnetic sensor 21 and the second magnetic sensor 22 are respectively mounted on the upper and lower surfaces of the first PCB board 20.

[0040] Specifically, in this embodiment, the first magnetic sensor 21 is mounted on the upper surface of the first PCB board 20, and the second magnetic sensor 22 is mounted on the lower surface of the first PCB board 20. The two sensors are fixed to opposite sides of the first PCB board 20, and their installation positions are completely corresponding in the vertical direction (i.e., the central axis of the second sensor coincides with the central axis of the first sensor), forming a cross-board facing structure. Simultaneously, the detection surfaces of both sensors face the center direction of the first through hole 23 (consistent with the orientation of the magnetic poles of the magnetic component 12), ensuring that when the magnetic component 12 passes through the through hole, the sensors on the upper and lower surfaces can synchronously capture its magnetic field signal. Both the first magnetic sensor 21 and the second magnetic sensor 22 are located around the periphery of the first through hole 23. The periphery can be such that one side of the first magnetic sensor 21 and the second magnetic sensor 22 faces the edge of the first through hole 23, while the other side is located inside the first PCB board 20.

[0041] It should be noted that the button assembly also includes a housing 30, and the key core assembly 10 is mounted on the housing 30. The key core assembly 10 also includes a fixing member 13. The housing 30 has a second through hole 31 located above the first through hole 23, and the fixing member 13 is installed in the second through hole 31. The pressing member 11 is slidably disposed on the fixing member 13. The pressing member 11 includes a pressing part 111 and a connecting rod part 112 integrally connected. The connecting rod part 112 extends toward the first through hole 23 and is inserted into the first through hole 23. The magnetic member 12 is installed in the connecting rod part 112. The upper end of the fixing member 13 forms a sliding groove 131. The key core assembly 10 also includes an elastic member 14, which is sleeved on the outside of the connecting rod part 112 and located between the pressing part 111 and the bottom wall of the sliding groove 131. A hollow shaft 132 for the connecting rod part 112 to pass through is provided on the bottom wall of the sliding groove 131. The hollow shaft 132 extends into the first through hole 23.

[0042] Specifically, the fixing member 13, as the core support component of the key core assembly 10, is installed in the second through hole 31 of the housing 30 (the second through hole 31 is located directly above the first through hole 23 of the first PCB board 20 and is coaxial with the first through hole 23), forming a guide structure that runs vertically through the structure. The upper end of the fixing member 13 is provided with a sliding groove 131, and a hollow shaft 132 is provided on the bottom wall of the sliding groove 131. The connecting rod part 112 of the pressing member 11 passes through the hollow shaft 132, and the hollow shaft 132 extends into the first through hole 23 of the first PCB board 20, so as to achieve precise positioning of the fixing member 13 and the first PCB board 20. The pressing component 11 adopts an integrated structure, including a pressing part 111 (located above the sliding groove 131 of the fixing component 13, for direct pressing by the user) and a connecting rod part 112 (extending downward from the pressing part 111, passing through the hollow shaft 132 of the fixing component 13 and the first through hole 23 of the first PCB board 20 in sequence, thus penetrating the first PCB board 20). The entire component can slide linearly along the sliding groove 131, hollow shaft 132 and first through hole 23 of the fixing component 13. The magnetic component 12 is built into the connecting rod part 112 and moves synchronously with the connecting rod part 112. Since the connecting rod part 112 penetrates the first PCB board 20, the magnetic component 12 will pass through the first PCB board 20 together with the connecting rod part 112 and complete the movement within the space on both sides of the first PCB board 20. The elastic element 14 is sleeved on the outside of the connecting rod portion 112 of the pressing element 11 (located above the first PCB board 20, inside the sliding groove 131 of the fixing element 13), and its two ends abut against the lower surface of the pressing portion 111 and the bottom wall of the sliding groove 131 of the fixing element 13 respectively, in a pre-compressed state, to provide the pressing element 11 with a reset elastic force.

[0043] A second through hole 31 is provided on the housing 30. The second through hole 31 is located directly above the first through hole 23 on the first PCB board 20. The diameter of the hole matches the shape of the fastener 13 and is used to fix the fastener 13. The second through hole 31 and the first through hole 23 are coaxially arranged, and together they provide vertically aligned through channels for the connecting rod 112 of the pressing member 11 and the hollow shaft 132 of the fastener 13, ensuring that the connecting rod 112 can smoothly penetrate the first PCB board 20 and that the movement trajectories of each component are completely consistent.

[0044] The fixing member 13 is installed in the second through hole 31 of the housing 30, and radial positioning is achieved through the second through hole 31. At the same time, the hollow shaft 132 of the fixing member 13 extends into the first through hole 23 of the first PCB board 20, and further restricts the radial displacement of the fixing member 13 through the first through hole 23, forming a three-point positioning structure of "housing 30-fixing member 13-first PCB board 20", ensuring that the fixing member 13 is always coaxial with the first through hole 23 and the second through hole 31, providing a stable guiding foundation for the sliding of the pressing member 11, and avoiding pressing jamming caused by the tilt of the fixing member 13.

[0045] The connecting rod 112 of the pressing member 11 passes through the hollow shaft 132 of the fixing member 13 and can slide linearly along the hollow shaft 132. When the user presses the pressing part 111, the pressing member 11 slides downward against the elastic force of the elastic member 14, and the connecting rod 112 drives the built-in magnetic member 12 to move downward synchronously; when the pressing part 111 is released, the elastic member 14 releases the pre-compression elastic force, pushes the pressing member 11 upward to reset, and the connecting rod 112 drives the magnetic member 12 back to the initial position. Throughout the sliding process, the hollow shaft 132 of the fixing member 13 always restricts the radial displacement of the pressing member 11, ensuring that the pressing member 11 moves only along the axial direction, and the magnetic field of the magnetic member 12 is always aligned with the detection area on the same side of the PCB board.

[0046] Please refer to Figure 3 In an optional embodiment, the button assembly further includes a second PCB board 40 disposed below the first PCB board 20 and a third magnetic sensor 41 mounted on the second PCB board 40, wherein the third magnetic sensor 41 is located below the second magnetic sensor 22; and the first PCB board 20 and the second PCB board 40 are arranged parallel to each other.

[0047] Specifically, in this embodiment, a second PCB board 40 is added. The second PCB board 40 has the same structural type as the first PCB board 20 (both are printed circuit boards with circuit wiring and component mounting functions), and is located below the first PCB board 20, maintaining parallel arrangement with it. The spacing between the two needs to be precisely designed based on the maximum downward stroke of the magnetic component 12, the mounting space of the third magnetic sensor 41, and the detection requirements. At the same time, it is ensured that the surface of the second PCB board 40 is completely parallel to the surface of the first PCB board 20, without tilting or misalignment, providing a structural basis for the subsequent precise alignment of the third magnetic sensor 41 and the second magnetic sensor 22. The third magnetic sensor 41 is also a Hall sensor, which is mounted on the upper surface of the second PCB board 40, and the first magnetic sensor 21, the second magnetic sensor 22, and the third magnetic sensor 41 are arranged facing each other in the vertical direction.

[0048] In this embodiment, a third magnetic sensor 41 is set on the second PCB board 40, adding a third level of detection on the basis of the original dual sensors. The downward stroke of the magnetic component 12 can be further extended from below the second magnetic sensor 22 to below the third magnetic sensor 41. Combined with the spacing of the double-layer PCB board and the sensor detection range, the effective stroke is increased by 0.8-1.5mm compared with the dual sensor solution, and finally an ultra-long stroke of 5.5-6.5mm can be achieved, which fully covers the needs of professional mechanical keyboards, gaming keyboards, industrial equipment keyboards and other keyboards for the ultimate deep pressing feel. Users can feel a stronger pressing feedback and rebound force when pressing, especially when pressing continuously in games or operating accurately in industrial scenarios, the operation recognition is greatly improved.

[0049] Furthermore, the button assembly also includes a fourth magnetic sensor mounted on the second PCB board 40, with the third magnetic sensor 41 and the fourth magnetic sensor mounted on the upper and lower surfaces of the second PCB board 40, respectively.

[0050] Specifically, in this embodiment, a fourth magnetic sensor 42 is added to the third magnetic sensor 41. The fourth magnetic sensor 42 is located on the lower surface of the second PCB board 40. The fourth magnetic sensor 42 is also a Hall sensor.

[0051] The addition of the fourth magnetic sensor 42 adds a fourth level of detection to the three-sensor system. The downward travel of the magnetic component 12 can be further extended from below the third magnetic sensor 41 to below the fourth magnetic sensor 42. Combined with the thickness of the second PCB board 40 and the detection range of the fourth sensor, the effective travel is increased by 0.6-1.2mm compared to the three-sensor solution, ultimately achieving an ultra-extreme travel of 6.2-7.7mm, fully covering the needs of professional gaming keyboards, heavy-duty industrial keyboards, and mechanical-feel simulated keyboards for "ultra-deep press feedback." Users can feel clearer "multi-segment press feedback" when pressing, and in scenarios such as game combo operations and precise input in industrial equipment, different operation commands can be accurately distinguished through differences in travel.

[0052] In an optional embodiment, both the first magnetic sensor 21 and the second magnetic sensor 22 are TMR sensors; the magnetic poles of the magnetic element 12 are distributed along the axial direction of the magnetic element 12.

[0053] Specifically, in this embodiment, the first magnetic sensor 21 and the second magnetic sensor 22 are TMR sensors (tunneling magnetoresistive sensors). TMR sensors operate based on the tunneling magnetoresistive effect, possessing magnetic field detection sensitivity far exceeding that of Hall sensors (typically 10-100 times that of Hall sensors), capable of detecting weak magnetic field changes; simultaneously, they exhibit excellent temperature stability (signal drift less than 1% within the range of -40℃ to 125℃) and are compact in size (package size as low as 1.0mm × 0.8mm), fitting well into the compact installation space of the first PCB board 20, making them particularly suitable for scenarios requiring high detection accuracy and environmental adaptability. The upper surface of the magnetic component 12 is the N pole, and the lower surface is the S pole. This arrangement causes the magnetic field generated by the magnetic component 12 to form a significant magnetic field gradient change in the axial (vertical) direction during vertical movement, highly compatible with the detection principle of the TMR sensor.

[0054] The high sensitivity of the TMR sensor and the axial magnetic pole distribution of the magnetic component 12 form a precise magnetic field-signal conversion relationship. When the magnetic component 12 with axial magnetic pole distribution moves vertically, it generates a magnetic field with a fixed direction and linear intensity change with distance in its upper and lower regions (e.g., when the N pole is facing upward, the magnetic field is upward above and downward below). The TMR sensor is extremely sensitive to subtle changes in the direction and intensity of the magnetic field—when the magnetic component 12 approaches the TMR sensor, the magnetic field intensity detected by the sensor increases; when it moves away, it weakens. This change can be converted by the TMR sensor into a clear resistance value change signal, thus accurately reflecting the displacement of the magnetic component 12.

[0055] This utility model also proposes a keyboard, which includes the above-described key assembly. The specific structure of the key assembly is as described in the above embodiments. Since this keyboard adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0056] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A button assembly, characterized in that, include: The key core assembly includes a synchronously movable pressing element and a magnetic element; A first PCB board is provided with a first magnetic sensor and a second magnetic sensor, which are arranged one above the other.

2. The button assembly as described in claim 1, characterized in that, Both the first magnetic sensor and the second magnetic sensor are Hall sensors; the magnetic poles of the magnetic element are distributed radially along the magnetic element.

3. The button assembly as described in claim 2, characterized in that, The first magnetic sensor and the second magnetic sensor are located on the same side of the magnetic component.

4. The button assembly as described in claim 3, characterized in that, The first PCB board has a first through hole for the magnetic component to pass through.

5. The button assembly as described in claim 4, characterized in that, The first magnetic sensor and the second magnetic sensor are located around the first through hole.

6. The button assembly as described in claim 3, characterized in that, The first magnetic sensor and the second magnetic sensor are respectively mounted on the upper and lower surfaces of the first PCB board.

7. The button assembly as described in claim 6, characterized in that, The first magnetic sensor and the second magnetic sensor are positioned vertically and vertically in a direction perpendicular to the first PCB board.

8. The button assembly as described in any one of claims 4 to 7, characterized in that, The button assembly further includes a second PCB board disposed below the first PCB board and a third magnetic sensor mounted on the second PCB board, wherein the third magnetic sensor is located below the second magnetic sensor; and the first PCB board and the second PCB board are arranged parallel to each other.

9. The button assembly as described in claim 8, characterized in that, The button assembly also includes a fourth magnetic sensor mounted on the second PCB board, wherein the third magnetic sensor and the fourth magnetic sensor are respectively mounted on the upper and lower surfaces of the second PCB board.

10. The button assembly as claimed in claim 1, characterized in that, Both the first magnetic sensor and the second magnetic sensor are TMR sensors; the magnetic poles of the magnetic element are distributed along the axial direction of the magnetic element.

11. A keyboard, characterized in that, Includes the button assembly as described in any one of claims 1 to 10.

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